Protective control method and apparatus

Details Protective control method and apparatus Protective control method and apparatus

1985-07-30

1988-09-27

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

364483, 364492, 361 86, 361 87, 361 93, H02H 328

Patent

active

047746211

ABSTRACT:
In an apparatus for producing data concerning a fault in an AC electric power system, an AC electric quantity is sampled at a frequency which is a multiple of the rated frequency of the AC electric quantity, and is stored, for later use as predicted values, and an arithmetic operation is performed on the sample values to produce a data concerning a fault in the power system. The predicted values are determined by the following equation: ##EQU1## where l and m represent natural numbers;

REFERENCES:
patent: 3984737 (1976-10-01), Okamura et al.
patent: 4333151 (1982-06-01), Matsushima
patent: 4344143 (1982-08-01), Kurosawa et al.
patent: 4577254 (1986-03-01), Yamaura

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